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Portable door lock that can be easily installed in seconds on any door that opens inward; providing you safety, security and privacy. You can use it at home or while traveling. Perfect for someone who travels often for work, or a student who needs extra security while off campus. XELAR can be used when staying in a hotel, renting an Air BnB, at college, or at home. This product is an affordable and effective way to add an extra layer of security to your life. Working principle. The door can't be open easily even if others have the key outside the room when you are sleep and rest. The claw of the metal board insert the strike plate firmly after close the door. Then the red board can play the role of stopper after install it on the mental board. You have to install the red board behind the door rather than the door frame, so you can prevent the door from opening. ATTENTION:This Product is just suitable for door that open inwards.And the width of the door seams must be over 3.1mm to use the metal plates. Package includes: 1 set of portable door lock 1 pieces of portable bag for the lock